Had the same problem... if you don't want to update to RH 8.0 (problem solved as they provide symlinks), then do do "locate docbook2html" (thanks to rpmfind.net) executables in RH 7.2 package named docbook-utils.
I seem to have the opposite problem... anyone have a clue what symlink is likely to make wine the happiest in light of all these options?
root@yodull greg # locate db2html /usr/bin/gnome-db2html2 /usr/bin/gnome-db2html3 /usr/bin/gnome2-db2html /usr/kde/2/bin/kdb2html /usr/kde/3/bin/kdb2html /usr/libexec/gnome2-db2html /usr/libexec/yelp-db2html /var/src/wine/documentation/db2html-winehq
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